Emerson WHITE-RODGERS 1E78 User manual

CONTENTS
Installation Instructions for
Heating & Air Conditioning
1E78
Non-Programmable Heat Only Thermostat
Preparations...
Thermostat Details.
Removing Old Thermostat
Mounting and Wiring..
Check Thermostat Operation ..3
Specifications.4
Troubleshooting.4
YOUR THERMOSTAT REPLACES
Typical System Compatibility Chart ___
Standard Heat Oniy Two Wire Gas or Oil Fired Systems (24 volt)
Electronic Ignition Heat Only Two Wire Systems (24 voit) _
Electronic Ignition Heat Only Gas or Oil Fired Systems (24 volt)
Standard Heat/Cooi Systems (24 volt) _
~Heat/Cool Systems Electric Heat (24 voit)
Heat Only Electric Heat Systems (24 volt) _ '
Cool Only Systems _ '
Heat Pump Systems (No Aux. or Emergency Heat)
Hot Water Zone Heat Only (Two Wire) Systems _
Hot Water Zone Heat Only (Three Wire) Systems
Line Voltage Heating or Baseboard 110/240 Volt Systems _
Millivolt Systems Floor or Wai! Furnaces
12 VDC Mobile Home Application
Multistage Systems
Systems Exceeding 30VAC, 1.5. Am
0 PREPARATIONS
Assemble tools required as shown below.
HAND OH POWER
DRILL WITH 3/16 INCH
CHILL SIT. IF NEEDED
FLAT BLADE SCREWDRIVER •
WIRE CUTTER/STR1PPEH
Failure to follow and read all instructions carefully
before installing or operating this control could cause
personal injury and/or property damage.
THERMOSTAT DETAILS
Mounting
Hole
Base Mounting Back of
Hole Thermostat Body
W904 - clip for Celcius display
W905 - clip for hydronic system
Figure 1. Thermostat
© REMOVING OLD THERMOSTAT
A CAUTION
To prevent electrical shock and/or equipment dam¬
age, disconnect electric power to system at main fuse
or circuit breaker box until installation is complete.
Before removing wires from old thermostaf s switching subbase,
label each wire with the terminal designation it was removed
from.
1. Remove Old Thermostat: A standard heat/cool thermostat
consists of three basic parts: '
a. The cover, which may be either a snap-on or hinge type.
b. The base, which is removed by loosening all captive
screws.
c. The switching subbase, which is removed by unscrewing
the mounting screws that hold it on the wall or adaptor
plate.
2. Shut off electricity at the main fuse box until installation is
complete. Ensure that electrical power is disconnected.
3. Remove the front cover of the old thermostat. With wires
still attached, remove wall plate from the wall. If the old
thermostat has a wall mounting plate, remove the thermostat
and the wall mounting plate as an assembly.
4. Identify each wire attached to the old thermostat using
the labels enclosed with the new thermostat.
5. Disconnecfthe wires from the old thermostat one at a time.
DO NOT LET WIRES FALL BACK INTO THE WALL.
6. Install new thermostat using the following procedures.
EMERSON.
White-Rodgers is a division
of Emerson Electric Co.
www.white-rodgers.com
PART NO. 37-6620A

© REMOVING OLD THERMOSTAT
continued from first page
ATTENTION! This product does not contain mercury.
However, this product may replace a unit which contains
mercury.
Do not open mercury cells. If a cell becomes damaged, do not
touch any spilled mercury. Wearing, non-absorbent gloves,
take up the spilled mercury and place into a container which can
be sealed. If a cell becomes damaged, the unit should be
discarded.
Mercury must not be discarded in household trash. When the
unit this product is replacing is to be discarded, place in a
suitable container and return to White-Rodgers at 2895 Harrison
Street, Batesville, AR 72501-2117 for proper disposal.
© MOUNTINGANDWIRING
A WARNING
Do not use on circuits exceeding specified voltage.
Higher voltage will damage control and could cause
shock or fire hazard.
Do not short out terminals on gas valve or primary
control to test. Short or incorrect wiring will dam¬
age thermostat and could cause personal injury
and/or property damage.
Thermostat installation and all components of the
system shall conform to Class II circuits per the
NEC code.
Hydronic (Hot Water or Steam)
Heating Systems
This thermostat is set to operate properly with a forced-air
heating system. If you have a hydronic heating system (a
system that heats with hot water or steam), you must set the
thermostat to operate properly with your system.
The factory default setting is forced air heat. Clipping jumper
W905 on the circuit board will produce a longer heating cycle
which is normally for hot water or steam (hydronic) systems.
Both settings produce a very accurate temperature control and
can be set to your personal preference. As received, the
thermostat cycles the system just under 1°F. With W905
clipped, the system cycles at approximately 1.5°F.
A CAUTION
Take care when securing and routing wires so they do
not short to adjacent terminals or rear of thermostat.
Persona! injury and/or property damage may occur.
TERMINAL CROSS REFERENCE CHART
New Thermostat
Other Manufacturers’
Terminal Designation
Terminal Designation
RH
4 RH M
W
W W H
Attach Thermostat Base to Wall
1. Remove the packing material from the thermostat. Gently
pull the body straight off the base. Forcing or prying on the
thermostat will cause damage to the unit.
2. Connect wires beneath terminal screws on. base using
appropriate wiring schematic (see fig. 2 ).
3. Place base over hole in wall and mark mounting hole
locations on wall using base as a template.
4. Move base out of the way. Drill mounting holes.
5. Fasten base loosely to wall, as shown in fig. 1, using two
mounting screws. Adjust until level, and then tighten
screws. (Leveling is for appearance only and will not affect
thermostat operation.) If you are using existing mounting
holes, or if holes drilled are too large and do not allow you
to tighten base snugly, use plastic screw anchors to secure
su t,base. 7 ;
6 . Push excess wire into wall and plug hole with, a fire-
resistant material (such as fiberglass insulation) to prevent
drafts from affecting thermostat operation.
Battery Location
This thermostat requires 2 “AAA” alkaline batteries to operate.
if “LO BATTERY” appears on the display, the batteries are low
and should be replaced with fresh “AAA” Energizer® alkaline
batteries. The batteries are located on the back of the thermo¬
stat body (see fig. 1 ).
Figure 2. Typical wiring diagram for
heat only, 2-wire, single transformer systems
2

CHECKTHERMOSTATOPERATiON
NOTE
To prevent static discharge problems, touch side of
thermostat to release static build-up before touching
any keys, .
if at any drne during testing your system does not operate
properly, contact a qualified serviceperson. '.
Heating System N
^ Move SYSTEM switch to HEAT position. If the heating
system has a standing pilot, be sure to light it.
2 press to adjust thermostat setting above room tem¬
perature. The heating system should begin to operate.
3 press <37 to adjust temperature setting below room
temperature. The heating system should stop operating.
Before you begin using your thermostat, you should be familiar
with fe atures and the display and the location and
operation of the thermostat buttons. Your thermostat consists
of two parts: the thermostat body and the base. To remove the
body, gently puli it straight out from the base. To replace the
Body! l ine U P t be body witb the base antJ press gently until the
|bdy snaps onto the base.
WHITE-RO DC BEtS
(T) (Up arrow) Raises temperature setting.
2^ (Down arrow) Lowers temperature setting.
SYSTEM switch (OFF, HEAT).
The Display
A js displayed when the SYSTEM switch is in the HEAT
jsition.
Displays current temperature.
LO BATTERY" is displayed when the 2 “AAA” batteries
arc low and should be replaced. Nothing else will be
displayed.
Displays currently set temperature (this is blank when
SYSTEM switch is in the OFF position).
Operating Features
mat you arc familiar with the thermostat buttons and
lay, read the following information to learn about the many
ures of the thermostat.
TEMPERATURE SETTING — Press or ^37 until the
^ows the temperature you want. The thermostat
e C0 P d'o r oom temperature at the selected ternpera-
^ CONVERTIBILITY — The factory default setting is
.® nieit - Clipping W904 jumper on the circuit board
ti n a ^ Wil! alfer feature to Celsius temperature
Figure 3. Thermostat display buttons and switches
• LOW BATTERY INDICATOR — If the 2 “AAA” alkaline
batteries are low and should be replaced, the display will be
blank except for “LO BATTERY”. When the batteries are
low, pressing any button will cause the display to operate for
. ten seconds. After ten seconds, the display will be blank-
except for “LO BATTERY". After “LO BATTERY” has been
displayed for 4 weeks, thenthermostat will drop the tempera¬
ture 10° below your setpoint in HEAT mode. You cannot
program with low batteries, but you can override setpoint
temperature.
TEMPERATURE DISPLAY ADJUSTMENT— Your new
thermostat has been accurately set in our factory. How¬
ever, if you wish, you may adjust your new thermostat
temperature display to match your old thermostat. This
can be accomplished (within a ±3° range) as follows:
1. Press and <377 at the same time for two seconds
with the SYSTEM switch in OFF position.
2. Press or 37 to adjust the displayed temperature
to your desired setting.
3. Move SYSTEM switch from OFF to exit the feature.
DISPLAY BACKLIGHT—The display backlight improves
display contrast in low lighting conditions. Selecting back¬
light ON will turn the light ori fora short period of time after
any button is pressed. Selecting backlight OFF (default)
will keep the light off. Turn the display backlight feature ON
as follows:
1. Press /-rr->, and 377 at the same time for two seconds
with the SYSTEM switch in HEAT position. The display
will alternately show “-L” AND “FF” (off).
2. Press /-r-s or 37 to change “FF” to “ON”.
3. Move SYSTEM switch to OFF to exit the feature.

SPECIFICATIONS
ELECTRICAL DATA
Electrical Rating:
0 to 30 VAC 50/60 Hz. or D.C.
0.05 to 1.0 Amps (Load per terminal)
1.5 Amps Maximum Total Load (All terminals combined)
THERMAL DATA
Setpoint Temperature Range: 45°F to 90°F (7°C to 32°C)
Operating Ambient Temperature Range: 32°F to 105°F
Operating Humidity Range: 0 to 90% RH (non-condensirtg)
Shipping Temperature Range: -40°F to 150°F
TROUBLESHOOTING
Reset Operation
If a voltage spike or static discharge blanks out the display or
causes erratic thermostat operation you can reset the thermo¬
stat by pressing and 'ZE? at the same time while moving
the SYSTEM switch from OFF to HEAT. This also resets the
factory defaults. If the thermostat has power, has been reset
and still does not function correctly contact your heating/cooling
service person or place of purchase.
Batteries
For optimum performance, we recommend.replacing batteries
once a year with fresh “AAA” Energizer alkaline batteries.
Symptom
Possible Cause Corrective Action
No Heat
(common problems)
1. Blown fuse or tripped circuit breaker.
2. Furnace power switch to OFF.
3. Furnace blower compartment door or
panel loose or not properly installed.
Replace Lise or reset breaker.
Turn switch to ON.
Replace door panel in proper position to engage safety interlock or door switch.
No Heat
1. Pilot light not lit.
Re-light pilot.
3. Loose connection to thermosiat or system.
4. Furnace Lock-Out Condition. Heat may also .
be intermittent.
5. Heating system requires service or
thermostat requires replacement.
Verify thermostat and system wires are securely attached.
Many furnaces have safety devices that shut down when a lock-out condition
occurs. If the heat works intermittently contact the furnace manufacturer or
local service person for assistance.
Diagonisiic: Set SYSTEM Switch to HEAT and raise the setpoint above room
temperature. Within a few seconds the thermostat should make a soft did
sound. This sound usually indicates the thermostat is operating property, if the
thermostat does not ciick, try the reset operation listed above. If the thermostat
does not dick after being reset contact your heating and cooling service person
or place of purchase for a replacement. If the thermostat clicks, contact the
furnace manufacturer or a service person to verify the heating is operating
correctly.
Heat, Runs
Constantly
1. Possible short in wiring.
2. Possible short in thermostat
3. Possible short in heat system.
Check each wire connection to verify they are not shorted or touching together.
No bare wire should stick out from under terminal screws. Try resetting the
thermostat as described above, if the condition persists the manufacturer of your
system or service person can instruct you on how to test the Heat system for
correct operation. If the system operates correctly, replace the thermostat
Furnace Cycles Too
Fast or Too Slow
(narrow or wide
temperature swing)
1. The location of the thermostat and/or the
size of the Heating System may be
influencing the cycle rate.
Digital thermostats normally provide precise temperature control and may cycle
faster than some older mechanical models. A fester cycle rate means the unit
turns on and off more frequently but runs for a shorter time so there is no
increase in energy use. If you would like to increase the cycle time, dip
jumper W-905 as mentioned in the instructions for Hydronic Heating Systems. It
is not possible to shorten the cycle time. If an acceptable cycle rate is not.
achieved as received or by clipping W-905 contact a local service person for
additional suggestions.
Thermostat Setting and
Thermostat
Thermometer Disagree
1. Thermostat thermometer setting requires
adjustment.
The thermometer can be adjusted +/- 3 degrees. See Temperature Display
Adjustment in the Operation section.
Blank Display and/or
Keypad Not Responding
1. Voltage spike or static discharge.
2. Battery change required.
Replace batteries and check heat/cool system for proper operation. If a voltage
spike occurs use the Reset Operation listed above.
The Emerson logo is a
trademark and service mark
of Emerson Electric Co.